Integration help needing: int 1/(a^2-u^2) du, int x^5/sqrt(x^12-3) du

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cmm13037

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Hello guys!
I am new to this forum. I am studying for an exam and there is two problems I can't seem to solve.
!.) integrate du/a2 -u2
2.)integrate x5 / sqrt( x12 -3 )
Help and explanations would be very much appreciated!
 
cmm13037 said:
Hello guys!
I am new to this forum. I am studying for an exam and there is two problems I can't seem to solve.
!.) integrate du/(a2 -u2) .............................. substitute u = a*sin(Θ)

2.)integrate x5 / sqrt( x12 -3 ) .............................. substitute u = x6

Help and explanations would be very much appreciated!
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